Hows u is a contraction of the question "How are you?"
Hows is derived from How is and although grammatically non-standard is paired with you, here abbreviated to u, in this phrase.
The term Hows can be used with other phrases to mean How are/is in a general sense.
Mr. A: hows u?
Ms. B: im good u?
Mr. A:good thx
Miss C: hows the weather?
Mrs. D: shit as ever
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